MKFileScanner 1.0.0

MKFileScanner

<p>file scanner in maui,need used with mkfilepicker nuget package.only support android and windows</p> <p> To use this package normal,add MkFilePicker NugetPackage to you maui project.</p> <p>为了正常使用该包，需要先安装MKFilePicker包到你的Maui项目上.</p> <p> 1.Scan file via folder:</p> <p>通过挑选的文件夹扫描</p> <p>on windows, you must provider a folder to scan,you can use MkFilePicker nuget package to pick a folderer or get from Environment.getxxxfolder or somehting else</p> <p>在windows上，你必须提供一个文件夹用来扫描，可以使用MkFilePicker挑选一个文件夹来扫描或者使用Environment相关api获取文件夹或者其他获得文件夹的方法</p> <code> private async Task Scan() { var res = await MKFilePicker.MKFilePicker.PickFolderAsync(null).ConfigureAwait(false); if (res != null) { MKFileScanner.MKFileScanner.Scan(res.PlatformPath,null, OnFileScanned); } }

async void OnFileScanned(FileResult fileResult)
{
    //open scanned file
    //打开扫描的文件
    using (var stream = MKFilePicker.MKFilePicker.OpenPickedFile(fileResult.PlatformPath, "r"))
    {
        Debug.WriteLine($"{fileResult.FileName},{fileResult.PlatformPath},{fileResult.AbsolutePath},{fileResult.FileSize},{stream.Length}");
    }
    //read metadata of scanned file
    //读取扫描文件的元数据
    var map = await MKFileScanner.MKFileScanner.ReadMetadataAsync(fileResult.PlatformPath);
    if(map != null)
    {
        //map.Name
        //map.CreateTime
    }
    if (map  is AudioMetadataMap audio)
    {
        //audio.SampleRate
        //audio.Artist
    }
    else if(map is VideoMetadataMap video)
    {
        //video.Resolution
    }
    else if(map is ImageMetadataMap image)
    {
        //image.Width
        //image.Height
    }
}

</code>

<p>2.scan without a folder</p> <p>直接扫描</p> <p>this only work on android,and you need take read/writeExternalStorgae permission</p> <p>只有安卓能这样做，而且你必须获得读写外部权限</p> <code> var status = await Permissions.CheckStatusAsync<Permissions.StorageRead>(); if (status != PermissionStatus.Granted) { status = await Permissions.RequestAsync<Permissions.StorageRead>(); if (status != PermissionStatus.Granted) { //未获取到权限 } } var options = new FileScanOption { FileType = FileType.Video,
//可以对文件名进行条件筛选，支持的语句将会转化为sql条件语句,不支持的将在扫描后过滤 //FileNameExpression = s ⇒ s.StartsWith("S") }; await Task.Run(() ⇒ MKFileScanner.MKFileScanner.Scan(null, options, OnFileScanned)); </code> <p>you can set FileScanOption.FileType to set which collection you want to scan </p> <p>你可以设置FileType的值来设置你想扫描哪个集合</p>

<p>3,scan file use option</p> <p>对扫描结果过滤</p> <p>limit file extension</p> <p>限制文件拓展名</p> <code> var options = new FileScanOption(); options.Extensions = new string[] { "jpg", "png" }; </code> <p>filter file name</p> <p>筛选文件名</p> <code> options.FileNameExpression = s ⇒ s.StartsWith("S"); </code> <p>file size bigger than 1kB and create time less one day</p> <p>筛选文件大于1kB且一天以内创建的</p> <code> options.MinFileSize = 1000; options.MinCreateTime = DateTime.Now - TimeSpan.FromDays(1); </code>